Phase 1003: document diagnostics actions chain extract (v0.8.970)

Roadmap Phase 1003 complete (47/50). Release notes, MESH_STABILITY,
and CI docs updated for diagnostics actions keys/UI modules.

Co-authored-by: Cursor <[email protected]>

release_notes/RELEASE_v0.8.970.md

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+# Release v0.8.970 — Phase 1003: Mesh Stability UI Diagnostics Actions Chain Embed Keys Extract
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI parity hardening
+
+## Summary
+
+Phase 1003 extracts the four-button diagnostics actions chain from `app.js`
+into dedicated platform keys and UI modules — button ids, labels, markup,
+and render order (sync export → mesh stability IPC → replication export →
+refresh) unchanged.
+
+## New Modules
+
+### `pearcord-platform/mesh-stability-ui-diagnostics-actions-keys.js`
+
+- 1 field key (`hasGuildSyncHealth`) + 4 embed parts + `chainOrder` registry
+- `buildMeshStabilityDiagnosticsActionsSnapshot()`
+
+### `apps/pearcord/ui/mesh-stability-ui-diagnostics-actions.js`
+
+- `buildMeshStabilityDiagnosticsActionsEmbedHtml()` — four-button chain embed
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-diagnostics-actions-build.cjs` — keys + UI embed + order
+- `smoke-phase1003-boot-gate.cjs` — version check (0.8.970)
+- `smoke-agentctl-mesh-stability-ui-diagnostics-actions-journey-stub.cjs` — agentctl stub
+- `test:mesh-stability-stats` — extended with diagnostics actions snapshot assertions
+- `test:gossip-rpc-pull-unit` — extended with diagnostics actions embed part keys
+- `test:ci-phase1003` — full CI bundle
+
+## Version
+
+`0.8.969` → `0.8.970`